Refactor InspectorWebPerfAgent: update lifecycle management to be per Local Frame root; replace hea…

third_party/WebKit/Source/core/timing/Performance.h

Index: third_party/WebKit/Source/core/timing/Performance.h
diff --git a/third_party/WebKit/Source/core/timing/Performance.h b/third_party/WebKit/Source/core/timing/Performance.h
index 002c903a83b47365a673c2aae1334b14ef58c525..eecb21efe08933e47d191e1f2568125cddf997b4 100644
--- a/third_party/WebKit/Source/core/timing/Performance.h
+++ b/third_party/WebKit/Source/core/timing/Performance.h
@@ -64,6 +64,7 @@ class CORE_EXPORT Performance final : public PerformanceBase,
   PerformanceTiming* timing() const override;
 
   void updateLongTaskInstrumentation() override;
+  bool observingLongTasks();
 
   ScriptValue toJSONForBinding(ScriptState*) const;
 
@@ -74,7 +75,8 @@ class CORE_EXPORT Performance final : public PerformanceBase,
 
   mutable Member<PerformanceNavigation> m_navigation;
   mutable Member<PerformanceTiming> m_timing;
-  mutable Member<InspectorWebPerfAgent> m_longTaskInspectorAgent;
+
+  bool m_observingLongTasks;
 };
 
 }  // namespace blink